Periodic Strings
Description
A character string is said to have period k if it can be formed by concatenating one or more repetitions of another string of length k. For example, the string "abcabcabcabc" has period 3, since it is formed by 4 repetitions of the string "abc". It also has periods 6 (two repetitions of "abcabc") and 12 (one repetition of "abcabcabcabc").Write a program to read a character string and determine its smallest period.
Input
The first line oif the input file will contain a single integer N indicating how many test case that your program will test followed by a blank line. Each test case will contain a single character string of up to 80 non-blank characters. Two consecutive input will separated by a blank line.
Output
An integer denoting the smallest period of the input string for each input. Two consecutive output are separated by a blank line.
Sample Input
1 HoHoHo
Sample Output
2
从1开始(该数同时被字符串长度取余为0),逐个尝试能否构成字符串的周期,若能,输出其最小周期,跳出循环。
#include<stdio.h> #include<string.h> int main() { int n, count1 = 1; scanf("%d", &n); while(n--) { getchar(); char str[83]; scanf("%s", str); int length = strlen(str); for( int i=1; i<=length ; i++ ) { if((length%i)==0) { bool flag=true; for( int j=i; j<length; j++ ) if(str[j] != str[j%i]) { flag=false; break; } if(flag) { if(count1!=1) printf("\n"); printf("%d\n", i); count1++; break; } } } } return 0; }